Tube



FIG. 1 is a front perspective view of a tube of the present invention;

FIG. 2 is a front view thereof (the rear view is identical);

FIG. 3 is a left-side view thereof (the right-side view is identical); and,

FIG. 4 is a top view thereof (the bottom view is identical). 

CLAIM The ornamental design for a tube, as shown and described. 